[Python-Dev] Binary Compatibility Issue with Python v2.6.5 and v3.1.2 (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Tue Apr 20 22:24:44 CEST 2010

Phil Thompson wrote:

When I build my C++ extension on Windows (specifically PyQt with MinGW) against Python v2.6.5 it fails to run under v2.6.4. The same problem exists when building against v3.1.2 and running under v3.1.1.

The error message is... ImportError: DLL load failed: The specified procedure could not be found. ...though I don't know what the procedure is. When built against v2.6.4 it runs fine under all v2.6.x. When built under v3.1.1 it runs fine under all v3.1.x. I had always assumed that an extension built with vX.Y.Z would always run under vX.Y.Z-1. Am I wrong in that assumption, or is this a bug in the latest versions?

You are not wrong in that assumption, but it still might not be a bug in the latest version. It could also be a bug in MingW or PyQt.

Before we can judge on that, we need to understand what exactly happened.

As a starting point for further research, try the sxstrace utility of your Vista installation.

Regards, Martin

More information about the Python-Dev mailing list